Seiko Cal. 3815 - 770

This Spring Drive model from 1978 features a 34mm Two-Tone case. With its 19mm lug width and 15.5mm profile, it sits comfortably on most wrists. [seikata-wm-26a743f41ef9]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

15.5mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Burgundy

Jewels

20j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1978

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